[vsnet-alert 2330] DX And rare outburst

[Taichi Kato <tkato>]

DX And rare outburst

  The long-period SS Cyg-type dwarf nova DX And is rising to one of its
rare outbursts.  The latest major outburst of DX And was observed in 1996
December.

   The present early detection, if confirmed, of an outburst of DX And
might provide another (the others CH UMa and GK Per) excellent opportunity
in probing the accretion disks in dwarf novae having long orbital periods,
whose outbursts seem to start from the inner part of accretion disks.
GK Per and CH UMa (1996 November) all showed a "plateau" before reaching
maximum light, during which the heating wave seems to propagate through
the accretion disk inside-out (Kim et al. 1992).  Follow-up (multicolor
and time-resolved) observations are recommended at this moment of the event.

References (GK Per):

    A. Bianchini et al. 1986, A&A 160, 367 (analysis of light curve)
    S. -W. Kim et al. 1992, ApJ 384, 269 (dwarf nova-type model)

  YYMMDD(UT)   mag  observer
  981023.958   147  (G. Poyner)
  981024.250   152  (R. J. Modic)
  981024.492  <144  (G. Hanson)
  981024.671  <134  (H. Maehara)
  981024.672  <145  (T. Watanabe)
  981024.747  <133  (H. Itoh)
  981024.880  <138  (T. Kinnunen)
  981025.235   152  (R. J. Modic)
  981025.817  <138  (E. Muyllaert)
  981025.912   147  (G. Poyner)
  981026.781  <138  (E. Muyllaert)
  981026.899  <138  (T. Kinnunen)
  981027.730  <138  (T. Kinnunen)
  981028.444   146: (G. Hanson)
  981029.410   146  (G. Hanson)
  981030.760  <138  (E. Muyllaert)
  981101.608  <129  (T. Watanabe)
  981101.816   140: (E. Muyllaert)
  981101.839   137  (T. Kinnunen)

For more information:

http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/DNe/dxand.html
http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/DNe/dxand9612.html

Regards,
Taichi Kato

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